Tractor



FIG. 1 is a front view of the new design, showing a tractor;

FIG. 2 is a back view of the tractor;

FIG. 3 is a left view of the tractor;

FIG. 4 is a right view of the tractor;

FIG. 5 is a top view of the tractor;

FIG. 6 is a bottom view of the tractor;

FIG. 7 is a perspective view of the tractor;

FIG. 8 is another perspective view of the tractor;

FIG. 9 is a perspective view of variation state of the tractor; and,

FIG. 10 is another perspective view of variation state of the tractor. 

CLAIM The ornamental design for a tractor, as shown and described. 